New Revised Standard Version
Another shall not be exchanged or substituted for it, either good for bad or bad for good; and if one animal is substituted for another, both that one and its substitute shall be holy.

Contemporary English Version
If you try to substitute any other animal, no matter how good, for the one you promised, they will both become holy and must be sacrificed.

New American Bible
The offerer shall not substitute or exchange another for it, either a worse or a better one. If the offerer exchanges one animal in place of another, both the original and its substitute shall become sacred.

Douay-Rheims Bible
And cannot be changed: that is to say, neither a better for a worse, nor a worse for a better. And if he shall change it: both that which was changed, and that for which it was changed, shall be consecrated to the Lord.

And cannot be changed: that is to say, neither a better for a worse, nor a worse for a better. And if he shall change it: both that which was changed, and that for which it was changed, shall be consecrated to the Lord.

Leviticus 27:15-33 But if he that vowed, will redeem it, he shall give the fifth part of the estimation over and above: and shall have the house. . . .

James 1:8 A double minded man is inconstant in all his ways.